Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Noritake Iron Works Co Ltd
NGK Insulators Ltd
NTT Inc
Original Assignee
Noritake Iron Works Co Ltd
NGK Insulators Ltd
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Noritake Iron Works Co Ltd, NGK Insulators Ltd, Nippon Telegraph and Telephone CorpfiledCriticalNoritake Iron Works Co Ltd
Priority to JP50064494ApriorityCriticalpatent/JPS51138955A/ja
Publication of JPS51138955ApublicationCriticalpatent/JPS51138955A/ja
Publication of JPS54338B2publicationCriticalpatent/JPS54338B2/ja